Koisuru Bitch no Toroana Jijou

Souta Miyano has a secret. He's weak when it comes to being played with from behind and desires something other than his finger to satisfy his needs. One night out, he gets too drunk and a coworker comes to his aid. It's then that he accidentally exposes his secret. Little did he know, their time in the bathroom stall that night would be just the beginning of more pleasures to come.

(Source: Renta!)